I was thinking this week...
I work for an oil drilling company, and how they get the power down to the drilling tool: they pump a fluid, and through a special lobe configuration, of a "rotor" and "stator", the drill bit is allowed to turn.
Think of it as a drill bit (which typically has two "lobes" or grooves). The "stator" has one more groove or lobe than the rotor, and the pressure differential forces the rotor to turn.
Of course this company used much larger tools!
I've often wondered why they don't use electrical power, but then I found out that the hole depth can reach several miles.
I'd be curious to see if this could be applied in a waterblock... for, I don't know, say, an active turbulator?
As for your impeller, you'd need to know what kind of force this motor is capable of. Your best bet at this point, would be to try a few basic designs:
#1: the straight paddlewheel
#2: the curved paddlewheel
You'll have to try them at various sizes.
Off-hand, because this motor has just enough power to move a fair quantity of air, I would expect it to be able to move water at the same mass rate.
Now how much denser is water, compared to air again?
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